Vc/scalar/simd_cast.h

0001 /*  This file is part of the Vc library. {{{
0002 Copyright © 2014-2015 Matthias Kretz <kretz@kde.org>
0003
0004 Redistribution and use in source and binary forms, with or without
0005 modification, are permitted provided that the following conditions are met:
0006     * Redistributions of source code must retain the above copyright
0007       notice, this list of conditions and the following disclaimer.
0008     * Redistributions in binary form must reproduce the above copyright
0009       notice, this list of conditions and the following disclaimer in the
0010       documentation and/or other materials provided with the distribution.
0011     * Neither the names of contributing organizations nor the
0012       names of its contributors may be used to endorse or promote products
0013       derived from this software without specific prior written permission.
0014
0015 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
0016 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
0017 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
0018 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
0019 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
0020 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
0021 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
0022 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
0023 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
0024 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
0025
0026 }}}*/
0027
0028 #ifndef VC_SCALAR_SIMD_CAST_H_
0029 #define VC_SCALAR_SIMD_CAST_H_
0030
0031 #include "../common/simd_cast.h"
0032 #include "type_traits.h"
0033 #include "macros.h"
0034
0035 namespace Vc_VERSIONED_NAMESPACE
0036 {
0037
0038 // Scalar::Vector to Scalar::Vector
0039 template <typename To, typename From>
0040 Vc_INTRINSIC Vc_CONST To
0041     simd_cast(Scalar::Vector<From> x, enable_if<Scalar::is_vector<To>::value> = nullarg)
0042 {
0043     return static_cast<To>(x.data());
0044 }
0045
0046 // Scalar::Mask to Scalar::Mask
0047 template <typename To, typename From>
0048 Vc_INTRINSIC Vc_CONST To
0049     simd_cast(Scalar::Mask<From> x, enable_if<Scalar::is_mask<To>::value> = nullarg)
0050 {
0051     return static_cast<To>(x.data());
0052 }
0053
0054 // Any vector (Vector<T> or SimdArray) to multiple Scalar::Vector<T>
0055 template <typename Return, int offset, typename T>
0056 Vc_INTRINSIC Vc_CONST Return simd_cast(
0057     T &&x,
0058     enable_if<Traits::is_simd_vector<T>::value && Scalar::is_vector<Return>::value> = nullarg)
0059 {
0060     return Return(x[offset]);
0061 }
0062
0063 template <typename Return, int offset, typename T>
0064 Vc_INTRINSIC Vc_CONST enable_if<offset == 0 && Traits::is_simd_vector<Return>::value &&
0065                                     !Scalar::is_vector<Return>::value,
0066                                 Return>
0067     simd_cast(Scalar::Vector<T> x)
0068 {
0069     Return r{};
0070     r[0] = static_cast<typename Return::EntryType>(x.data());
0071     return r;
0072 }
0073
0074
0075 // Any mask (Mask<T> or SimdMaskArray) to multiple Scalar::Mask<T>
0076 template <typename Return, int offset, typename T>
0077 Vc_INTRINSIC Vc_CONST Return simd_cast(
0078     T &&x,
0079     enable_if<Traits::is_simd_mask<T>::value && Scalar::is_mask<Return>::value> = nullarg)
0080 {
0081     return Return(bool(x[offset]));
0082 }
0083
0084 template <typename Return, int offset, typename T>
0085 Vc_INTRINSIC Vc_CONST enable_if<
0086     offset == 0 && Traits::is_simd_mask<Return>::value && !Scalar::is_mask<Return>::value,
0087     Return>
0088     simd_cast(Scalar::Mask<T> x)
0089 {
0090     Return r(false);
0091     r[0] = x[0];
0092     return r;
0093 }
0094
0095 }  // namespace Vc
0096
0097 #endif  // VC_SCALAR_SIMD_CAST_H_
0098
0099 // vim: foldmethod=marker